The question is incomplete. The options are:
a. Quid pro quo
b. Two-party
c. unilateral
d. one-party
Answer:
b. Two-party
Step-by-step explanation:
-Quid pro quo: is when a product or service is exchange for something that has value.
-Two-party: is an agreement that is made between two people.
-Unilateral: is an agreement in which a person promises something in exchange for an act made by another person.
One-party: is an agreement in which one party makes a promise and has the contractual obligation.
According to this, the answer is that this is an example of a two-party contract because John and Sue made an agreement to increase the amount of time they spend painting.